Precision indicator for gauge measuring



May 29, 1.928.

M. BARTHOLDY PRECISION INDICATOR FOR GAUGE MEASURING Filed June 24, 1924Patented May` -29, i `Ulll'lliil) 'e STATES.' PATENT yFFICE..

"irai BAa'rHoILDY, or nssnN, GERMANY, AssIGNon 'ro Faim). xmrrr4Ax'rInNcmsnLLscHAF'r, or EssENoNrHERUHR, GERMANY.

PRECISION INDICATOR FOR GAUGE MEASUBING.

. L Application me?. June 24,1924, Serial No. 722,130, andin GermanyAugust 6, 1923.

This invention relates to precision indithe bolt D is in its position ofrest, a spring cators such as are more particularly de- T arrangedbetween the feeling plate b2 and signed to be used in testing Works tobe the collar d1 acts to hold the bolt D by one ground, of the faces ofthe collar d1 against a face b*y Shafts, bolts and bores which should.be ofthe bolt B. The inner end of the trans- 60 ground, first have tobe turned preparatorily mittmg bolt D is in contact with one of the to ameasure being by 0.2 to 1.0 mm. greater end faces of a bolt L whichisshiftable .in or smaller than the desired measure and the direction ofits axis and guided in the then finished by grinding them to thedecasing A and in a sleeve Mcarried by the l0 sired measure. Themeasuring range of the said casing. In the position of the parts 65Well-known precision indicators is, much too shown by the drawing, theother end face of small for such large grinding allowances. the bolt Llies at a small distance from the Now, the invention has for its objectto end face of a coaxially arranged interprovide a precision indicatorof the kind medlate boltN which is longitudinally shiftl stated whichhas a comparatively large able in a guide P of the casing A. The in- 70measuring rangeand permitsavery accurate termediate bolt N is providedwith a collar determination of the desired measurement. nl in the pathofv which lies a fixed stop p1.

An embodiment of the subject-matter of By means. of a blade S supportedon the bolt the` invention is illustrated, by way of ex- N, a blade Sfixed to the casing and a spring ample, in the accompanying drawmg, 1nIt, the pointer Q is mounted for oscillation 75 which y similarly to theassembly K, J, J1, H.

. Fig. 1 is a front elevation of the precision lThe spring T is strongerthan the spring R.

indicator partly in section, t The pointers K and Q move over scales K1Fig. 2 is a central longitudinal section of and Q1, respectively; Theratio of transmisthe precision indicator, sion between the tworegistering systems can 80 'Fig 3 is'a section along the line 3 3 of beadjusted by adjusting the distance be- Fig. 2, seen from above, andtween the fixed and movable blades J, J

Fig. 4 is a section along the line 4--4 of or S, S', or both of them, inthe manner Fig. 1, likewise seen from above. shown in my said priorPatent No. 1,425,-

A is a casing in which a bolt B is shiftable 438. The adjustment ischosen so that, 85

which 'has attached to it by means of screws when the same shiftingmotion isl imparted L b1. (Fig. 1) a plate b2 which is adapted to toboth bolts, thel defiection of the small be placedy intoconnection withthe Work to pointer Q will be much larger than that of be gauged by theintermediary of a feeling the large pointer K. Both scales# K1 and boltU'in any suitable known manner. The Q1 are provided with pointer marksk2 90 bolt B is provided with a threaded' bore b3 and g2 g3 offknowndesign and adapted to be 4 (Figf2) receiving a set screw C the head 01.adJuste-d in a suitable manner, for example of which projects into acorresponding bore as shownnin U. S. Patent No. 1,422,169. of the`plateb2 so as to be easily` accessible. For measuring, the precisionindicator is 40 Thev free 'end c2 of the .set screw C which aflixed inwell-known manner to a gaugey 95 extends beyond the bolt B abuts againstan and placed, by the intermediary of the feelintermediate bolt F whichvis shifta yly guiding bolt U, into engagement with the piece ed inasleeve G. This bolt F is provided to be Worked so that thebolt B will bewith a collar f1 in the path of which is arshifted with relation to thecasing A in ranged a fixed stop g1. In a manner shown accordance 'withthe progression. of the 100 for example in my prior Patent No. 1,425,working.

438,. August 8th, 1922 the bolt F supports a When ,the precisionindicator is used in a blade. J1 while a blade vJ is supported by therider gauge, the feeling bolt U and therefore casing and between thesetwo .a pointer also the bolt B will be shiftedfurther into element K ismounted and retained in the casing A in accordance with the progres- 105position by means of a spring H attached sion ofthe working. In thiscase, the screw thereto and to the casing. There is fur- C must beadjusted previous tothebeginther mounted for shifting Imotion in the jning of the grinding in lsuch a manner as to bolt B a transmitting bolt.D '(Figirh2) cause the large pointer Kv to 'take Aits posiwhichisprovided with a collar d1. en tionin front of the right-hand end markof 110 the scale K1 when the small pointer Q registers with theright-hand end mark of its scale Q1. In the position of rest, bothpointers are then at the left-hand end of their corresponding scales anda small space eX- ists between the upper end of the bolt L and thelower' end of the intermediate bolt N (Fig. 2). Every shifting movementof the bolt B is transmitted by means of the screw C to the intermediatebolt F which, by the intermediary of the blade J1, rocks the pointer Kin clockwise direction around the stationary blade J contrary to theaction of the spring H so that the pointer will move over the scale K1from the left to the right. Owing to the space eXistin between the boltsL and N the pointer will remain, at first, in its left-hand endposition. Only upon the' pointer K reaching a position near theright-hand end mark of its scale K1, will the bolt L have been shiftedby the transmitting bolt D so far upwardly that it will come intocontact with the bolt N. This is the case when the preparatory grindinghas been terminated. Upon continuing the grinding the pointer Q islikewise rocked in clockwise direction around the blade S by means of'the blade S1, contrary to the action of the spring R. The reading nowtakes place at the scale AQ1. Thus, the less sensitive large pointer `Kserves to test the dimensions of the work during the preparatorygrinding and the small pointer Q which indicates with a much greateraccuracy, serves to effect the testing during the finishing grindingwithoutit being necessary to alter the adjustment of the gauge duringthe working operation.

When using the precision indicator in a hole or caliper gauge, thefeeding bolt B will shift during the progressive working of the piece inthe direction of the arrowA m through the intermediary of suitabletrans- Afer members which may be constructed in the manner illustratedin Patent No. 1,048,073. In this case, the'screw C must be adjustedbefore the beginning of the working in such a manner as toca-use bothpointers to simultaneously register With the lefthand end mark of theirscales. If the indicator is then put on the work which has been turnedpreparatorily but not yet ground, the bolt B will be shifted into thecasing so thatv both pointers will first move from the left to theright. The small pointer.

strike against the stop 01 so that any further shifting of the bolt N isprevented. Therefore the transmitting bolt D can no longer be carriedalong by the bolt B, but the bolt B will be'shift'ed with relation tothe bolt D contrary to the action of the spring T. If

. the working of the work-piece is now begun,

K will immediately move towards its left limit position. The bolt Bshifts further and further in the direction of the arrow while thevtransmitting bolt D remains in connection with the intermediate bolt Nby the actionof the spring T and through the intermediary of the bolt L.As soon as the-4 working has progressed so much and the bolt B shiftedso far as to cause the reengagement -of the collar d1., of thetransmitting bolt D with the stop face b4 of the bolt B, the smallpointer Q will likewise begin its movement from the right to the left.The reading now takes place at the scale Q1. The' pointer marks k2 'k3and g2 g3 may be used for adjusting, previous to the working, the limitsof the accuracy to be observed for each of the two measuringsystems. Inusing the subject-matter of the invention in a hole or caliper gauge, itis therefore also possible to employ the less sensitive measuring systemfor t-he testing during the preparatory grinding and the much moreaccurately indicatinr other measuring-system during the nishing grindingwithout it being necessaryto alter the adjustment of the gauge.

In comparison with precision indicators having only one measuring-systemthe subject-matter of the invention therefore offers the advantage ofallowing the dimensions of the work to be watched during the entireworking operation with only one implement and the desired measure to bereached with thev greatest accuracy in spite of the comparatively largeoveror undermeasure, respectively. As a matter ofcourse, still othery-measuring systems of different sensibilities 1 may be arranged in thecommon caslng. Be-

sides, the adjustment of thev precision indicator may be effected byscrews with knurled heads or the like which are accessible from theoutside and adapted to be adjusted by hand.

I claim: Y

l. In a precision indicator of the type described, a plurality ofmovable pointers, a slidable bolt adapted to be moved by a feedinmechanism, and rectilinearly displaceab e transmission means interposedbetween said bolt and the respective pointers and operable directl uponthe latter, said transmission means lieing constructed to impart to saidpointers diierent degrees of movement fuor a given movement of saidbolt.

2. In a precision indicator of the type described, a plurality ofmovable pointers, scales for'said pointers, a'slidable bolt adapted tobe moved by a feeling mechanism.

transmission means between said bolt and lthne respective pointers, saidtransmission means bein constructed to impart to said pointers di erentdegrees of movement for a given movement of said bolt, and means for-relatively adjusting said pointers to cause them to indicate a givenvalue on said scales simultaneously.

3. In 'a precision indicator, a plurality of movable pointers, aslidable bolt adapted to be moved by a feelingmechanism, andtransmission means between said bolt and the respective pointers, one ofsaid transmission means including a lost motion connection forpermitting initial movement of said bolt without effect upon one of saidpointers, said transmission means being constructed to impart to saidpointers dierent degrees gflmovement for a given movement of said 4. Ina precision indicator of the type described, a pair of'movable pointers,a slidable bolt adapted to be moved by a feeling mechanism, andindependent transmission means between said bolt and said pointers, oneof said transmission means being adjfustable for altering the relativepositions of tho pointers, said transmission means being constructed toimpart to said pointers different degrees of movement for a givenmovement of said bolt.

5. 'In a precision indicator of the 4type de-A scribed, two movablepointers, a slidable bolt adapted to be moved by a feeling mechanism,independent transmission means inserted between said bolt and each of-said l ointers, one of said transmission means bemission meansinterposed between said bolt,l

and each of said transmission means being constructed to lmpart to itspolnter a greater degree of movement for a given movement ,of said boltthan the other transmission.

means, said first mentioned transmission means including a lost motionconnection and a yieldably supported transmission element for permittinginitial movement of said bolt in either direction Without effect uponsaid first mentioned pointer.

7. In a precision indicator, two movable pointers, a slidable boltadapted to be moved by, a feeling mechanism, a transmission deviceconstantly in operative position between one of said pointers and saidbolt, and a second transmission-means interposed between the otherpointer and saidy bolt, comprising a lost motion device for permittingan initial movement of said bolt without moving 4 greater degree ofmovementl for a given` movement of said bolt than the other, stops forlimiting the movements of said transmission means, said first mentionedtransmission means including a lost motion connection, and means forvarying the length of the other transmission means.

9. In a precision indicator, two movable ointers, a slidable boltadapted to be moved y a feeling mechanism, independent rectilinearlymovable transmission means interposed between said bolt and therespective pointers, one of said transmission means being constructed toimpart to its pointer a greater degree of movement for a given movementof said bolt than the other, stops for limiting the movements. ofsaidtransmission means, said first mentioned transmission meanscomprising aslidable rod, a pin yieldably supported in said bolt for moving saidrod, and a stop for limitin the movement of said pin, and means orvarying the length of the other transmission means. 10. In a precisionindicator of the type described, a plurali-ty of movable pointers, a

slidable bolt adapted to be moved by a feeling mechanism, andtransmission means in- .terposed between said bolt and the respectivepointers, one of said transmission means including means for permittinginitial movement of said bolt without effect upon the correspondingpointer, said transmission means being constructed to impart to saidpointers different degreesL of movement for a given movement of saidbolt.

The foregoing'specification signed at Essen, Germany, this 28th day ofMay, 1924 'Y MAX BARTHoLnY.

CERTIFICATE or coRRECTIoN.

Patent No, 1,671,220. crantednay 29, 1928, fo

l MAX BARTHOLDY.

It is hereby certified that error appears in the printed specificationof the above nmbered patent requiring correction as follows: Page 2,lines l19'and 120, claim 1, for the word "feeding" read. "feeling";`page3, line 43, claim 5, for the misspelled word "transmision" read"transmission"; same page, line 48, claim 6, after the word "said"insert the words "pointers, one of said" and .line 77, claim 8, for theword "feeding" read "feeling"; andthat 4the sgidLetters Patent should bereadwith these corrections therein that the same may conform .to therecord of the case in the Patent Office.

Signed and sealed this 19th day of June, A. D. 1928.

M, J. Moore, (Seal) Acting Commissioner of Patents.

